docs: move the 'Voice Files Provided' section of voices.md to the top introduction section of the file.

docs/voices.md

     - [dictmin](#dictmin)
     - [alphabet2](#alphabet2)
     - [dictdialect](#dictdialect)
-- [Voice Files Provided](#voice-files-provided)
-  - [default](#default)
 
 ----------
 
 dialect) together with various attributes that affect the
 characteristics of the voice quality and how the language is spoken.
 
-Voice files are placed in the `espeak-data/voices` directory,
+Voice files are located in the `espeak-data/voices` directory, and are
-or within subdirectories in there.
+grouped by the language family of the language being specified in the
+voice files.
+
+The `default` voice is used if none is specified in the speak command. You
+can copy your preferred voice to "default" so you can use the speak command
+without the need to specify a voice.
 
 ## Contents of Voice Files
 
 Additional attributes are available to set various internal options
 which control how language is processed. These would normally be set in
 the program code rather than in a voice file.
-
-## Voice Files Provided
-
-A number of Voice files are provided in the `espeak-data/voices` directory.
-You can select one of these with the `-v <voice filename>` parameter to
-the `espeak-ng` command.
-
-#### default
-
-This voice is used if none is specified in the speak command. You can
-copy your preferred voice to "default" so you can use the speak command
-without the need to specify a voice.